Bartending Terminology

What does "one way" in the terminology barman say? ?
I ordered a butter nipple shot last week, and the waiter asked me if I wanted "in a way." He said for your help. I did not see exactly what it mixed. I was in Myrtle Beach, SC, at a time.
this is something new that I have never heard of as far as ordering drinks! Here in New York, called "one way" crazy customers, have no patience when they know their business and want all your attention and then DONT TIP! Do you remember what you put on the nipple butter? Because a nipple should butter and caramel baileys in a shot glass! (Kahula is good instead of Baileys too!)
Bartending Tips : Bartending Terms: Part 1